CN110289366B - Cover plate structure, manufacturing method thereof, display panel and display device - Google Patents
Cover plate structure, manufacturing method thereof, display panel and display device Download PDFInfo
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- CN110289366B CN110289366B CN201910372058.1A CN201910372058A CN110289366B CN 110289366 B CN110289366 B CN 110289366B CN 201910372058 A CN201910372058 A CN 201910372058A CN 110289366 B CN110289366 B CN 110289366B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/822—Cathodes characterised by their shape
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/841—Self-supporting sealing arrangements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
The application relates to the technical field of display, in particular to a cover plate structure, a manufacturing method of the cover plate structure, a display panel and a display device. The cover plate structure can comprise a color film unit and an auxiliary electrode unit, wherein the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer; the auxiliary electrode unit comprises a first spacing column formed on the position, corresponding to the black matrix, of the flat layer, a first auxiliary electrode covering the first spacing column, a second spacing column formed on the first auxiliary electrode and corresponding to the first spacing column, and a second auxiliary electrode covering the second spacing column, wherein the second auxiliary electrode is used for being in contact with a top electrode on the array substrate. The scheme can prolong the service life of the display panel.
Description
Technical Field
The application relates to the technical field of display, in particular to a cover plate structure, a manufacturing method of the cover plate structure, a display panel and a display device.
Background
At present, in order to increase the electrode conductivity in an OLED (Organic Light-Emitting Diode) display panel, an auxiliary electrode is often fabricated on a package cover plate; for example, a spacer Pillar (PS) is disposed on the encapsulation cover plate provided with the color film layer, and then the auxiliary electrode is fabricated on the spacer pillar, so that in the subsequent process of encapsulating the OLED display panel, the encapsulation glue material is extruded by the spacer pillar, and the auxiliary electrode formed on the spacer pillar can penetrate through the encapsulation glue material to contact with the top electrode in the array substrate, thereby achieving the effect of reducing the resistance of the top electrode. However, since the color film layer disposed on the encapsulation cover plate is mostly made of organic materials, water vapor is easily accumulated in the color film layer in various processes, and thus after encapsulation, the water vapor is easily conducted to the top electrode along the PS, so as to corrode the top electrode and the organic light emitting functional layer located below the top electrode, thereby forming black spots and affecting the service life of the OLED display panel.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
An object of the present application is to provide a cover plate structure, a method for manufacturing the cover plate structure, a display panel, and a display device, which can improve the service life of the display panel.
The present application provides in a first aspect a cover plate structure comprising:
the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer;
and the auxiliary electrode unit comprises a first spacing column formed on the position, corresponding to the black matrix, of the flat layer, a first auxiliary electrode covering the first spacing column, a second spacing column formed on the first auxiliary electrode and corresponding to the first spacing column, and a second auxiliary electrode covering the second spacing column, and the second auxiliary electrode is used for being in contact with a top electrode on the array substrate.
In one exemplary embodiment of the present application,
a groove is formed in the surface, deviating from the color film unit, of the first spacer, and the wall of the groove is covered with the first auxiliary electrode;
the second spacing columns are arranged in the grooves, and the height of the second spacing columns is larger than the groove depth of the grooves.
In one exemplary embodiment of the present application,
the second spacing columns are in seamless fit with the first auxiliary electrodes covered on the groove walls of the grooves.
In one exemplary embodiment of the present application,
the height of the first spacer is 5-10 μm, the groove depth of the groove is 4-8 μm, and the height of the second spacer is 5-10 μm.
In one exemplary embodiment of the present application,
the first spacing column and the second spacing column are made of photoresist resin materials.
In one exemplary embodiment of the present application,
the first auxiliary electrode and the second auxiliary electrode are made of metal conducting materials, indium zinc oxide or indium tin oxide.
In one exemplary embodiment of the present application,
the sum of the thicknesses of the first auxiliary electrode and the second auxiliary electrode is 10nm to 100 nm.
In one exemplary embodiment of the present application,
the orthographic projection of the first spacing column on the packaging cover plate is positioned in the orthographic projection of the black matrix.
In one exemplary embodiment of the present application,
the auxiliary electrode unit is provided in plurality,
the first auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure; and/or
The second auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure.
A second aspect of the present application provides a method for manufacturing a cover plate structure, which includes:
forming a color film unit, wherein the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer;
forming a first spacing column on the position of the flat layer corresponding to the black matrix;
forming a first auxiliary electrode covering the first spacer;
forming a second spacer corresponding to the first spacer on the first auxiliary electrode;
and forming a second auxiliary electrode covering the second spacing column, wherein the second auxiliary electrode is used for contacting with the top electrode on the array substrate.
In one exemplary embodiment of the present application,
after forming a first spacer on a position of the planarization layer corresponding to the black matrix and before forming a first auxiliary electrode covering the first spacer, the method further includes:
forming a groove on the surface of the first spacer, which is far away from the color film unit; the groove is used for accommodating the second spacing column, and the height of the second spacing column is larger than the groove depth of the groove.
A third aspect of the present application provides a display panel, comprising:
the array substrate comprises a substrate, a pixel defining layer formed on the substrate, an organic light-emitting function layer formed on the pixel defining layer, and a top electrode formed on the organic light-emitting function layer;
in the cover plate structure of any of the above, the auxiliary electrode unit is opposite to the position of the pixel defining layer, and the second auxiliary electrode is in contact with the top electrode.
A fourth aspect of the present application provides a display device comprising the display panel described above.
The technical scheme provided by the application can achieve the following beneficial effects:
the application provides a cover plate structure, a manufacturing method of the cover plate structure, a display panel and a display device, because the first spacer pillar and the first auxiliary electrode are arranged between the second spacer pillar and the color film unit, that is, the first spacer pillar and the first auxiliary electrode block a path between the second spacer pillar and the color film unit, after the cover plate structure and the array substrate are packaged, the first spacer can firstly absorb certain water vapor accumulated in the color film unit and then can block certain water vapor through the first auxiliary electrode, this can alleviate the spread of water vapor onto the second spacer pillars and the portions of the second auxiliary electrodes that are in contact with the top electrode, therefore, the condition that water vapor is conducted to the top electrode and the organic light-emitting functional layer can be relieved, the condition that the top electrode and the organic light-emitting functional layer are corroded by the water vapor to form black spots is avoided, and the service life of the display device is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic view showing a structure of a display panel in the related art;
FIG. 2 is a schematic structural diagram of a cover plate structure according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for manufacturing a cover plate structure according to an embodiment of the present disclosure;
fig. 4 shows a schematic diagram of the completion of step S300;
FIG. 5 shows a schematic diagram of the completion of step S302;
fig. 6 shows a schematic diagram of the completion of step S304;
fig. 7 shows a schematic diagram of the completion of step S306;
fig. 8 shows a schematic structural diagram of a display panel according to an embodiment of the present application.
Reference numerals:
in fig. 1: 10. packaging the cover plate; 11. a color film layer; 12. a spacer pillar; 13. an auxiliary electrode; 14. an auxiliary electrode column; 15. a top electrode; 16. and an organic light emitting functional layer.
In fig. 2, 4 to 8: 20. packaging the cover plate; 21. a black matrix; 22. a color film layer; 23. a planarization layer; 24. a first spacer pillar; 240. a groove; 25. a first auxiliary electrode; 26. a second spacer pillar; 27. a second auxiliary electrode; 40. a substrate base plate; 41. a pixel defining layer; 42. an organic light-emitting functional layer; 43. a top electrode.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting on the number of their objects.
In recent years, OLEDs have been gradually developed in the technical field of display lighting, and particularly in the display industry, due to the advantages of high response, high contrast, flexibility and the like, OLEDs are considered to have wide application prospects. For top-emitting OLED display devices, attention is paid due to advantages such as higher aperture ratio and optimized light extraction using microcavity effect. For the top emission structure, the top electrode as the light emitting surface OLED must have good light transmittance.
At present, thin metal, ITO, IZO and other materials are generally used for the top-emitting transparent electrode, wherein the metal is used as a large-area electrode after being thinned due to poor transmittance, which is likely to cause resistance increase, and thus is not favorable for the development of large-size devices. Since the conductive performance of the material with high transparency, such as ITO, IZO, etc., is weaker than that of the metal in the low temperature process, in the prior art, the metal is usually used as the auxiliary electrode and fabricated on the non-light emitting region of the back plate by photolithography, so as to improve the overall conductivity of the top electrode and achieve the effect of reducing the resistance. However, this photolithography technique requires a complicated process, involves multiple mask plates and exposure processes, and is not suitable for mass production because it requires high temperature, resist washing, and other process characteristics, which may damage the light-emitting layer of the OLED device.
In order to avoid the problems in the above manufacturing process, in the related art, in order to increase the electrode conductivity in the OLED display panel, the auxiliary electrode 13 is often manufactured on the package cover plate 10; as shown in fig. 1, a spacer Pillar (PS) may be disposed on the encapsulation cover plate 10 provided with the color film layer 11, and then the auxiliary electrode 13 is fabricated on the spacer pillar 12, so that in a subsequent process of encapsulating the OLED display panel, the encapsulation adhesive material is extruded by the spacer pillar 12, and the auxiliary electrode 13 formed on the spacer pillar 12 can pass through the encapsulation adhesive material to contact with the top electrode 15 in the array substrate, thereby achieving an effect of reducing the resistance of the top electrode. In order to ensure the function of the auxiliary electrode 13, an auxiliary electrode column 14 may be formed on the side of the spacer 12 facing the package cover 10, and the auxiliary electrode column 14 is in communication with the auxiliary electrode 13, so as to enhance the electrical conductivity.
However, since the color film layer 11 disposed on the encapsulation cover plate 10 is mostly made of organic materials, moisture is easily accumulated in the color film layer 11 during various processes, and thus after encapsulation, the moisture is easily conducted to the top electrode 15 along the spacer 12, so as to erode the top electrode 15 and the organic light emitting functional layer 16 located below the top electrode, thereby forming black spots, which affects the service life of the OLED display panel.
In order to solve the above technical problem, an embodiment of the present application provides a cover plate structure, which can be used in an OLED display panel. As shown in fig. 2, 4 to 8, the cover structure includes a color film unit and an auxiliary electrode unit, specifically:
the color film unit may include an encapsulation cover plate 20, a black matrix 21 and a color film layer 22 formed on the encapsulation cover plate 20, and a flat layer 23 covering the black matrix 21 and the color film layer 22. It should be understood that a plurality of color film layers 22 may be provided, and the plurality of color film layers 22 may include at least a red color film layer for transmitting red light, a green color film layer for transmitting green light, and a blue color film layer for transmitting blue light; the color film layers 22 may be disposed on the package cover plate 20 at intervals and arranged in an array, and in addition, the adjacent color film layers 22 respectively cover the edge area of the black matrix 21, thereby exposing the middle area of the black matrix 21. The flat layer 23 covers the middle area of the black matrix 21 (i.e. the part of the black matrix 21 not covered by the color film layer 22) and each color film layer 22; the flat layer 23 may be formed of a resin material having elasticity, for example, a resin material having elasticity such as phenol-based resin, polypropylene-based resin, polyimide-based resin, acryl-based resin, or the like; in addition, the thickness of the planarization layer 23 is about 1 μm to 2 μm, but is not limited thereto.
The auxiliary electrode unit may include a first spacer pillar 24 formed on a position of the planarization layer 23 corresponding to the black matrix 21, a first auxiliary electrode 25 covering the first spacer pillar 24, a second spacer pillar 26 formed on the first auxiliary electrode 25 and corresponding to the first spacer pillar 24, and a second auxiliary electrode 27 covering the second spacer pillar 26, the second auxiliary electrode 27 being for contact with a top electrode 43 on the array substrate; it should be noted that the orthographic projection of the first spacer 24 on the package cover 20 should be located in the orthographic projection of the black matrix 21 on the package cover 20, so that the black matrix 21 can completely block the first spacer 24, so as to avoid the situation that a user views the first spacer 24 through the color film unit. In addition, the orthographic projection of the second spacer pillar 26 on the flat layer 23 is located within the orthographic projection of the first spacer pillar 24 on the flat layer 23.
For example, the first and second spacers 24 and 26 may be made of a photoresist material, so that when the first and second spacers 24 and 26 are fabricated, a step of coating a photoresist may be omitted, and the photoresist material may be directly exposed, developed, stripped, baked, etc. to form the first and second spacers 24 and 26, thereby reducing the processing cost of the first and second spacers 24 and 26. And the first and second auxiliary electrodes 25 and 27 may be made of a metal conductive material, such as, but not limited to, metal magnesium (Mg), metal silver (Ag), metal molybdenum (Mo), metal neodymium (Nd), metal aluminum (Al), or Indium Tin Oxide (ITO). In addition, the thicknesses of the first auxiliary electrode 25 and the second auxiliary electrode 27 are 10nm to 100nm later, but not limited thereto.
It should be understood that the cover plate structure may include a plurality of auxiliary electrode units, as shown in fig. 2, the first spacing pillars 24 of each auxiliary electrode unit may be arranged in an array on the planarization layer 23, and adjacent first spacing pillars 24 may be arranged at intervals of one or several sub-pixels; for example, when the first auxiliary electrodes 25 of each auxiliary electrode unit are processed, a first auxiliary electrode material may be vapor-deposited on the first spacers 24 of each auxiliary electrode unit by a full-layer vapor deposition method to form a full-layer electrode structure covering each first spacer 24, and it should be noted that the full-layer electrode structure may also be covered with the flat layer 23 while covering each first spacer 24, so as to improve the covering stability of the first auxiliary electrodes 25 and prevent the first auxiliary electrodes 25 from falling off from the first spacers 24.
The second spacer pillars 26 of the auxiliary electrode units are respectively formed on the first spacer pillars 24 of the auxiliary electrode units, and the second spacer pillars 26 and the first spacer pillars 24 are separated by the first auxiliary electrodes 25; wherein the second auxiliary electrodes 27 of each auxiliary electrode unit are connected to form a whole-layer electrode structure, for example, when the second auxiliary electrodes 27 of each auxiliary electrode unit are processed, the second auxiliary electrode material can be vapor-deposited on the second spacer pillars 26 of each auxiliary electrode unit by a whole-layer vapor deposition method to form a whole-layer electrode structure covering the second spacer pillars 24, it should be noted that, here, the whole-layer electrode structure covers the second spacer pillars 26 and also covers the first auxiliary electrodes 25, which not only can improve the covering stability of the second auxiliary electrodes 27, thereby avoiding the second auxiliary electrodes 27 from falling off from the second spacer pillars 26, but also can increase the conductive capability of the second auxiliary electrodes 27 because the second auxiliary electrodes 27 cover the first auxiliary electrodes 25, that is, the first auxiliary electrodes 25 and the second auxiliary electrodes 27 can be electrically conducted, thereby further achieving the effect of reducing the resistance of the top electrode 43.
Based on the above, since the first spacer pillar 24 and the first auxiliary electrode 25 are disposed between the second spacer pillar 26 and the color filter unit in this embodiment, that is, the first spacer pillar 24 and the first auxiliary electrode 25 block the path between the second spacer pillar 26 and the color filter unit, after the cover structure and the array substrate are packaged, the first spacer 24 can absorb the water vapor accumulated in the color film unit to a certain extent, and then the first auxiliary electrode 25 can block the water vapor to a certain extent, this can alleviate the spread of moisture onto the second spacer posts 26 and the portions of the second auxiliary electrodes 27 that are in contact with the top electrodes 43, therefore, the condition that water vapor is conducted to the top electrode 43 and the organic light-emitting functional layer 42 can be relieved, the condition that black spots are formed due to corrosion of the water vapor to the top electrode 43 and the organic light-emitting functional layer 42 is avoided, and the service life of the display panel is prolonged.
In an embodiment, as shown in fig. 5, a groove 240 is formed on a surface of the first spacer 24 away from the color filter unit, and the second spacer 26 is disposed in the groove 240, it should be noted that the first auxiliary electrode 25 covers the first spacer 24, and since the groove 240 belongs to a portion of the first spacer 24, it can be known that a wall (including a groove sidewall and a groove bottom wall) of the groove 240 is also covered with the first auxiliary electrode 25, as shown in fig. 6, that is, the second spacer 26 is separated from the wall of the groove 240 by the first auxiliary electrode 25.
In this embodiment, the second spacer pillar 26 is disposed in the groove 240, so that the situation of lateral deviation (the lateral direction is a direction perpendicular to the height direction of the second spacer pillar 26) caused by poor adhesion between the second spacer pillar 26 and the first auxiliary electrode 25 can be avoided, thereby improving the structural stability of the whole auxiliary electrode unit and ensuring the contact stability between the second auxiliary electrode 27 on the second spacer pillar 26 and the top electrode 43.
Optionally, the second spacer pillar 26 is seamlessly attached to the first auxiliary electrode 25 covered on the wall of the groove 240, so that the situation of lateral deviation caused by poor adhesion of the second spacer pillar 26 to the first auxiliary electrode 25 can be further avoided, and the contact stability between the second auxiliary electrode 27 on the second spacer pillar 26 and the top electrode 43 can be ensured.
In addition, as shown in fig. 2, the height of the second spacer pillar 26 is greater than the depth of the groove 240, in other words, the surface of the second spacer pillar 26 facing away from the color film unit protrudes beyond the edge of the groove 240 (the edge is a portion of the surface of the first spacer pillar 24 facing away from the color film unit where the groove 240 is not formed), so that the second auxiliary electrode 27 covered on the second spacer pillar 26 can be ensured to be in contact with the top electrode 43, and meanwhile, the first auxiliary electrode 25 can be prevented from being in contact with the top electrode 43, so that the moisture in the color film unit can be prevented from spreading to the top electrode 43, and the service life of the display panel is prolonged.
Illustratively, the height of the first spacer 24 may be 5 μm to 10 μm; the groove depth of the groove 240 may be 4 μm to 8 μm, and the height of the second spacer pillar 26 may be 5 μm to 10 μm, where the height and the groove depth refer to the thickness direction (e.g., the Y direction in fig. 2) of the cover plate structure. In addition, the first and second spacers 24 and 26 are both of a pillar structure, the cross-sectional width of the first spacer 24 is 20 μm to 50 μm, and the cross-sectional width of the groove 240 is 10 μm to 30 μm; the cross-sectional width of the second spacer pillar 26 is adapted to the cross-sectional width of the groove 240, as long as the second spacer pillar 26 can be attached to the first auxiliary electrode 25 on the wall of the groove 240 without a seam, and it should be noted that the cross-sectional width mentioned here is the dimension in the X direction in fig. 2.
An embodiment of the present application further provides a manufacturing method of a cover plate structure, where the cover plate structure may be the cover plate structure described in any of the above embodiments, and as shown in fig. 3, the manufacturing method of the cover plate structure may include:
step S300, forming a color film unit, wherein the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer;
step S302, forming a first spacing column on the position, corresponding to the black matrix, of the flat layer;
step S304, forming a first auxiliary electrode covering the first spacing column;
step S306, forming a second spacing column corresponding to the first spacing column on the first auxiliary electrode;
step S308, forming a second auxiliary electrode covering the second spacer pillar, where the second auxiliary electrode is used to contact with the top electrode on the array substrate.
According to the cover plate structure manufactured by the manufacturing method, the first spacing column and the first auxiliary electrode are arranged between the second spacing column and the color film unit, namely, the first spacing column and the first auxiliary electrode separate a path between the second spacing column and the color film unit, so that after the cover plate structure and the array substrate are packaged, the first spacing column can firstly absorb certain water vapor accumulated in the color film unit, and then the first auxiliary electrode can block the water vapor to a certain degree, so that the condition that the water vapor spreads to the second spacing column and the part of the second auxiliary electrode, which is in contact with the top electrode, can be relieved, the condition that the water vapor is conducted to the top electrode and the organic light-emitting functional layer can be relieved, the condition that the top electrode and the organic light-emitting functional layer are corroded by the water vapor is avoided, and the service life of the display panel is prolonged.
The following describes a method for manufacturing the cover plate structure in detail with reference to the accompanying drawings.
In step S300, a color film unit is formed, as shown in fig. 4, the color film unit includes an encapsulation cover plate 20, a black matrix 21 and a color film layer 22 formed on the encapsulation cover plate 20, and a planarization layer 23 covering the black matrix 21 and the color film layer 22. Illustratively, the black matrix 21 and the color film layer 22 may be sequentially formed on the package cover plate 20 by exposure, development, etc., and then the planarization layer 23 covering the black matrix 21 and the color film layer 22 may be formed on the package cover plate 20 by spin coating. The flat layer 23 can be made of an elastic resin material such as phenol-based resin, polypropylene-based resin, polyimide-based resin, acryl-based resin, or the like. Of course, the color film unit in this embodiment may also be provided with other layer structures besides the black matrix 21, the color film layer 22 and the planarization layer 23 according to actual situations.
In step S302, the first spacer 24 is formed on the flat layer 23 at a position corresponding to the black matrix 21, as shown in fig. 5. Specifically, the step S302 may include: first, a first photoresist resin material layer is formed on the planarization layer 23, and for example, the first photoresist resin material layer may be coated on the planarization layer 23 by spin coating or the like and then cured to form the first photoresist resin material layer on the planarization layer 23; next, the first photoresist layer is exposed and developed to form first spacers 24 on the flat layer 23 at positions corresponding to the black matrix 21.
In step S304, the first auxiliary electrode 25 is formed to cover the first spacer 24, as shown in fig. 6. Illustratively, the first auxiliary electrode 25 material may be deposited on the package cover plate 20 by PVD (Physical Vapor Deposition) to form a first auxiliary electrode 25 covering the first spacer 24, and it should be noted that the first auxiliary electrode 25 covers the planarization layer 23 while covering the first spacer 24. The first auxiliary electrode 25 may be made of, but not limited to, magnesium (Mg), silver (Ag), molybdenum (Mo), neodymium (Nd), aluminum (Al), Indium Zinc Oxide (IZO), or Indium Tin Oxide (ITO).
In step S306, a second spacer pillar 26 is formed on the first auxiliary electrode 25, and an orthogonal projection of the second spacer pillar 26 on the planar layer 23 may be located within an orthogonal projection of the first spacer pillar 24 on the planar layer 23, as shown in fig. 7. Specifically, the step S306 may include: first, a second photoresist resin material layer is formed on the first auxiliary electrode 25, and for example, the second photoresist resin material may be coated on the first auxiliary electrode 25 by spin coating or the like and then cured to form the second photoresist resin material layer on the first auxiliary electrode 25; next, the second photoresist layer is exposed and developed to form second spacers 26 corresponding to the first spacers 24 on the first auxiliary electrodes 25. Note that an orthogonal projection of the second spacer pillar 26 on the flat layer 23 is located within an orthogonal projection of the first spacer pillar 24 on the flat layer 23.
In step S308, a second auxiliary electrode 27 is formed to cover the second spacer pillar 26, as shown in fig. 2, the second auxiliary electrode 27 being used to contact the top electrode 43 on the array substrate. Illustratively, the second auxiliary electrode 27 material may be deposited on the package cover 20 by PVD (Physical Vapor Deposition) to form a second auxiliary electrode 27 covering the second spacer pillars 26, and it should be noted that the second auxiliary electrode 27 covers the first auxiliary electrode 25 while covering the second spacer pillars 26. The second auxiliary electrode 27 may be made of, but not limited to, magnesium (Mg), silver (Ag), molybdenum (Mo), neodymium (Nd), aluminum (Al), Indium Zinc Oxide (IZO), or Indium Tin Oxide (ITO).
In an embodiment, after the step S302 and before the step S304, the method for manufacturing the cover plate structure may further include:
step S303, forming a groove 240 on the surface of the first spacer 24 away from the color film unit, as shown in fig. 5; for example, the surface of the first spacer 24 facing away from the color film unit may be processed by exposure, development, or the like to form the groove 240. The groove 240 is used to accommodate the second spacer pillar 26, that is, the second spacer pillar 26 can be formed at the position of the groove 240. After step S304, the wall of the groove 240 is covered with the first auxiliary electrode 25, that is, the second spacer pillar 26 formed subsequently is isolated from the wall of the groove 240 by the first auxiliary electrode 25. Further, the second spacer pillar 26 formed subsequently and the first auxiliary electrode 25 covering the groove wall of the groove 240 may be attached seamlessly.
In this embodiment, the first spacer 24 is provided with the groove 240, and the second spacer 26 is formed in the groove 240, so that the situation of lateral deviation caused by poor adhesion between the second spacer 26 and the first auxiliary electrode 25 can be avoided, and the contact stability between the second auxiliary electrode 27 on the second spacer 26 and the top electrode 43 can be ensured.
It should be noted that the height of the second spacer 26 formed subsequently needs to be greater than the depth of the groove 240, so that the second auxiliary electrode 27 covered on the second spacer 26 can be ensured to be in contact with the top electrode 43, and meanwhile, the condition that the first auxiliary electrode 25 is in contact with the top electrode 43 can also be avoided, so that the condition that water vapor in the color film unit spreads to the top electrode 43 can be avoided, and the service life of the display panel is prolonged.
In one embodiment, the black matrix 21(BM), the color film layer 22(CF), and the planarization layer 23 may be sequentially formed on the package cover plate 20 by exposure, development, and the like; second, forming first spacer pillars 24 having a height of about 5 μm and a cross-sectional width of about 50 μm on the planarization layer 23 at positions corresponding to the Pixel Definition Layer (PDL) of the array substrate; then, a groove 240 with the section width of about 30 μm and the groove depth of about 4 μm can be formed on the first spacing column 24; and forming a first ITO auxiliary electrode (i.e., a first auxiliary electrode 25) having a thickness of about 50nm on the encapsulation cover plate 20, covering the first spacer pillars 24 and the planarization layer 23; finally, forming a second spacer pillar 26 with a height of about 9 μm in the groove 240 on the first spacer pillar 24 by exposure and etching; and a second ITO auxiliary electrode (i.e., a second auxiliary electrode 27) covering the second spacer pillars 26 and the first ITO auxiliary electrode and having a thickness of about 50nm is formed on the package cover 20, that is: and finishing the manufacture of the cover plate structure. In this embodiment, the structure formed by the first and second spacers 24 and 26, the first and second auxiliary electrodes 25 and 27 may be referred to as an auxiliary electrode unit.
The embodiment of the application also provides a display panel which can be an OLED display panel. As shown in fig. 8, the display panel may include an array substrate and the cover plate structure described in any of the embodiments. Wherein:
the array substrate may include a base substrate 40, a pixel defining layer 41 formed on the base substrate 40, an organic light emitting function layer 42 formed on the pixel defining layer 41, and a top electrode 43 formed on the organic light emitting function layer 42, and this top electrode 43 may be a cathode, for example. It is to be understood that a bottom electrode (i.e., the bottom electrode may be an anode), a TFT (Thin Film Transistor), and the like included in the array substrate are not shown for the sake of simplicity.
The auxiliary electrode unit of the cover plate structure may be opposite to the position of the pixel defining layer 41, specifically, the first and second spacing pillars 24 and 26 in the auxiliary electrode unit may be opposite to the position of the pixel defining layer 41. When the cover plate structure is pressed on the array substrate, the second auxiliary electrode 27 in the cover plate structure can contact with the top electrode 43 of the array substrate, so as to reduce the resistance of the top electrode 43.
The embodiment of the present application further provides a display device, which may include the display panel described in the foregoing embodiment. The display device can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet personal computer, a television, a notebook computer, a digital photo frame, a navigator and the like.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
Claims (11)
1. A cover plate structure, comprising:
the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer;
an auxiliary electrode unit including a first spacer formed at a position of the planarization layer corresponding to the black matrix, a first auxiliary electrode covering the first spacer, a second spacer formed on the first auxiliary electrode and corresponding to the first spacer, and a second auxiliary electrode covering the second spacer, the second auxiliary electrode being for contact with a top electrode on the array substrate;
a groove is formed in the surface, deviating from the color film unit, of the first spacer, and the wall of the groove is covered with the first auxiliary electrode;
the second spacing columns are arranged in the grooves, and the height of the second spacing columns is larger than the groove depth of the grooves.
2. The lid structure of claim 1, wherein said second spacer pillars seamlessly engage said first auxiliary electrode overlying the walls of said recess.
3. The cover structure according to claim 2,
the height of the first spacer is 5-10 μm, the groove depth of the groove is 4-8 μm, and the height of the second spacer is 5-10 μm.
4. The cover structure according to claim 1,
the first spacing column and the second spacing column are made of photoresist resin materials.
5. The cover structure according to claim 1,
the first auxiliary electrode and the second auxiliary electrode are made of metal conducting materials, indium zinc oxide or indium tin oxide.
6. The cover structure according to claim 1,
the sum of the thicknesses of the first auxiliary electrode and the second auxiliary electrode is 10nm to 100 nm.
7. The cover structure according to claim 1,
the orthographic projection of the first spacing column on the packaging cover plate is positioned in the orthographic projection of the black matrix.
8. The cover structure according to claim 1,
the auxiliary electrode unit is provided in plurality,
the first auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure; and/or
The second auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure.
9. A manufacturing method of a cover plate structure is characterized by comprising the following steps:
forming a color film unit, wherein the color film unit comprises an encapsulation cover plate, a black matrix and a color film layer which are formed on the encapsulation cover plate, and a flat layer which covers the black matrix and the color film layer;
forming a first spacing column on the position of the flat layer corresponding to the black matrix;
forming a first auxiliary electrode covering the first spacer;
forming a second spacer corresponding to the first spacer on the first auxiliary electrode;
forming a second auxiliary electrode covering the second spacing column, wherein the second auxiliary electrode is used for contacting with a top electrode on the array substrate; wherein after forming the first spacer pillar on the flat layer at a position corresponding to the black matrix and before forming the first auxiliary electrode covering the first spacer pillar, the method further comprises:
forming a groove on the surface of the first spacer, which is far away from the color film unit;
the groove is used for accommodating the second spacing column, and the height of the second spacing column is larger than the groove depth of the groove.
10. A display panel, comprising:
the array substrate comprises a substrate, a pixel defining layer formed on the substrate, an organic light-emitting function layer formed on the pixel defining layer, and a top electrode formed on the organic light-emitting function layer;
the cover plate structure of any one of claims 1 to 8, said auxiliary electrode unit being opposite to where said pixel defining layer is located, and said second auxiliary electrode being in contact with said top electrode.
11. A display device characterized by comprising the display panel according to claim 10.
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| CN201910372058.1A CN110289366B (en) | 2019-05-06 | 2019-05-06 | Cover plate structure, manufacturing method thereof, display panel and display device |
| PCT/CN2020/087519 WO2020224487A1 (en) | 2019-05-06 | 2020-04-28 | Cover board structure and manufacture method therefor, display panel and display device |
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| CN201910372058.1A CN110289366B (en) | 2019-05-06 | 2019-05-06 | Cover plate structure, manufacturing method thereof, display panel and display device |
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| CN110289366B (en) * | 2019-05-06 | 2021-10-12 | 京东方科技集团股份有限公司 | Cover plate structure, manufacturing method thereof, display panel and display device |
| KR20210147123A (en) * | 2020-05-27 | 2021-12-07 | 삼성디스플레이 주식회사 | Display panel and manufacturing method of the same |
| CN112366281B (en) * | 2020-11-09 | 2023-04-07 | 合肥京东方卓印科技有限公司 | Packaging cover plate and manufacturing method thereof, display panel and display device |
| CN112993192A (en) * | 2021-02-08 | 2021-06-18 | 京东方科技集团股份有限公司 | Packaging cover plate, manufacturing method thereof, display panel and display device |
| CN113299702B (en) * | 2021-05-08 | 2022-07-12 | 深圳市华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
| CN113346028B (en) * | 2021-05-31 | 2024-04-19 | 京东方科技集团股份有限公司 | Light-emitting device, preparation method and display device |
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| WO2020224487A1 (en) | 2020-11-12 |
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